Across
- 3. They are used to describe matter, like colour or conductivity
- 5. Substance that reacts with another substance in a chemical reaction to create new substances with different propeties
- 7. A table in which elements are organized by their physical and chemical properties
- 10. Number of protons in the nucleus of one atom of an element
- 13. States that mass cannot be created or destroyed
- 16. Chemical reaction that absorbs energy
- 17. Pure substance formed when at least one metal and one non-metal combine
- 18. A positively charged particle
- 20. Slow chemical change that occurs when oxygen in the air reacts with a metal
- 21. Occurs when a material changes from one state o another
- 23. Matter which has a specific composition and specific properties / every pure element
- 24. Horizontal row of elements in the periodic table
Down
- 1. Chemical reaction that releases energy
- 2. Vertical column of elements in the periodic table
- 4. Pure substance formed when non-metals combine
- 6. New substance produced in a chemical reaction between reactants
- 8. Mass of one atom of an element
- 9. Pure substance that cannot be broken down into other substances
- 11. Anything that has mass and takes up space
- 12. The most reactive non-metals
- 14. Occurs when two or more materials react and create new materials
- 15. Elements that have both metallic and non-metallic properties
- 19. A system of easy-to-use warning symbols on hazardous materials
- 22. Chemical reaction that occurs when oxygen reacts with a substance to form a new energy and give off energy